Frequency-encoded linear cluster states with coherent Raman photons

Abstract

Entangled multi-qubit states are an essential resource for quantum information and computation. Solid-state emitters can mediate interactions between subsequently emitted photons via their spin, thus offering a route towards generating entangled multi-photon states. However, existing schemes typically rely on the incoherent emission of single photons and suffer from severe practical limitations, for self-assembled quantum dots most notably the limited spin coherence time due to Overhauser magnetic field fluctuations. We here propose an alternative approach of employing spin-flip Raman scattering events of self-assembled quantum dots in Voigt geometry. We argue that weakly driven hole spins constitute a promising platform for the practical generation of frequency-entangled photonic cluster states.

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• Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots
• Optimized protocol to create repeater graph states for all-photonic quantum repeater
• Coarse-graining in retrodictive quantum state tomography